脉冲磁场和Cr对Al-5.3Fe合金组织及高温性能的影响  

Effects of Pulsed Magnetic Field and Trace Cr on Microstructure and High Temperature Mechanical Properties of Al-5.3Fe Alloy

作　　者：罗琨[1] 胡敏[1] 蒋恒超 林昱[1] 张磊 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室

出　　处：《特种铸造及有色合金》2014年第4期437-440,共4页Special Casting & Nonferrous Alloys

基　　金：江西省教育厅2012年度科技计划资助项目(GJJ12432);南昌航空大学第八届"三小"科技创新基金项目

摘　　要：研究了微量Cr和脉冲磁场对Al-5.3Fe合金凝固组织和高温力学性能的影响。结果表明,在Al-5.3Fe合金中单独添加微量（0.3%）Cr,初生Al3Fe相由粗大的板片状或长针状转变为较大的花朵状。电压在0~250V范围内,随放电电压的增加,添加0.3%的Cr的Al-5.3Fe合金凝固组织逐步细化,初生Al3Fe相由较大的花朵状逐渐变为细小的颗粒状。在微量Cr和脉冲磁场共同作用下,Al-5.3Fe合金高温抗拉强度和伸长率分别达到了147.5MPa和1.85%,比未经任何处理的Al-5.3Fe合金,分别提高了48.4%和172.1%。Effects of pulsed magnetic field （PMF） and trace Cr on microstructure and high temperature mechanical properties of AI-5.3Fe alloy were investigated. The results show that with 0.3% Cr addi- tion, primary A13 Fe compound is transformed from coarse bulky structure or long＇acicular structure into rosette ones. With the increase of discharging voltage in range of 0-250 V, average size of primary A13Fe particles in the alloy contained 0.3% Cr is further decreased, where rosette-like primary A13Fe phase is converted into fine particular structure. At 300 ℃, the tensile strength and elongation of A1- 5.3Fe alloy contained 0.3% Cr under PMF reach up to 147.5 MPa and 1.85%, respectively, increased by 48.4% and 172.1% ,respectively, compared with those of the alloy without PMF treatment.

关 键 词：脉冲磁场 CR A1-5 3Fe合金 高温力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG144[金属学及工艺—金属材料]